Per the last statement in the message below: "The danger running without a working ion pump, though, is that at eventually you'll damage the electron multiplier."
Is it correct to presume then that the EM becomes covered in "cesium splatter" and thus the S/N output gets poor? -Brian, WA1ZMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of wje Sent: Monday, August 18, 2008 1:43 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5061A problem If you install the second unit, your 5061A still won't work. +20v at the sensor output will signal the ion current monitor to shut down the electron multiplier supply. If you have some high-value resistors around, can you make up a test 200M resistor string? If so, see what happens when that's connected across 4 & 5 of the first 3500 v supply. However, even with the failure case you describe with the first unit, I'd expect your 5061A to still work at least for a short time. Do you have beam current? If not, you might have other problems as well. Check the voltage at A15 pin 4. You should have +18 v or so. If not, more troubleshooting is in order. Bill Ezell ---------- They said 'Windows or better' so I used Linux. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
